I raised rats for a long time when I was younger. They were just normal pet store rats, but I was crazy about them. My first two were an albino female, and a black male. They were named Ghost and Demon. I was kinda in a gothic point at the time. I let them breed once. I gave away a couple of the babies, and the mother ate the rest. So if you're not used to breeding them, watch the mother closely, once the babies are weaned, and have some spare cages/aquariums/whatever ready.